Initial pi0.7 minimal validation

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+# Third-party notices
+
+This repository is an independent educational implementation. It does not
+contain code, weights, datasets, or other assets copied from Physical
+Intelligence.
+
+At the time this project was prepared, no original pi0.7 paper, official
+pi0.7 training implementation, checkpoint, or complete technical model card
+was available in the public Physical Intelligence/openpi materials inspected
+by the authors. Consequently, names such as `TinyMEMEncoder`,
+`TinyGoalGenerator`, `HighLevelPolicy`, and `Pi07Mini` describe this
+repository's own teaching implementation. They must not be interpreted as
+official class names or proof of the unpublished system's internals.
+
+The project uses the earlier public pi-family literature and public openpi
+repository only as background for vision-language-action policies, action
+chunking, and flow matching. No source file from openpi is vendored here.
+
+Runtime dependencies retain their own licenses and copyright notices:
+
+- PyTorch
+- NumPy
+- Pillow
+- Matplotlib
+- PyYAML
+- pytest (development only)
+
+Users are responsible for complying with the licenses and terms of any
+external images, trajectories, datasets, or checkpoints they supply. The
+default configuration points to a local manifest and this repository does not
+redistribute the source PAI data.